Specifications

AN93
140 Rev. 0.9
Table 97. International Call Progress Registers
Register Value Function
Dial Tone Control
U0–U14 Dial Tone Detect Filter Coeffi-
cients
U15 DTON Dial Tone On Threshold
U16 DTOF Dial Tone Off Threshold
U34 DTWD Dial Tone Detect Window
U35 DMOT Dial Tone Minimum On Time
Busy Tone Control
U17–U2B Busy Tone Detect Filter Coeffi-
cients
U2C BTON Busy Tone On Threshold
U2D BTOF Busy Tone Off Threshold
U2E BMTT Busy Tone Minimum Total Time
U2F BDLT Busy Tone Delta Time
U30 BMOT Busy Tone Minimum On Time
Ringback Cadence Control
U31 RMTT Ringback Tone Minimum Total
Time
U32 RDLT Ringback Tone Delta Time
U33 RMOT Ringback Tone Minimum On
Time
Ring Detect Control
U49 RGFH Ring Frequency High
U4A RGFD Ring Frequency Delta
U4B RGMN Ring Cadence Minimum On
Time
U4C RGNX Ring Cadence Maximum Total
Time
Table 98. Dial Registers
Register Value Function
Pulse Dial Control
U37–U40 Pulse per Digit Definition
U42 PDBT Pulse Dial Break Time
U43 PDMT Pulse Dial Make Time
U45 PDIT Pulse Dial Interdigit Time
DTMF Control
U46 DTPL DTMF Power Level (and
Twist)
U47 DTNT DTMF On Time
U48 DTFT DTMF Off Time
Table 99. Line Interface/Control Registers
Register Bit Value Function
U4D 10 CLPD Check Loop Current Before
Dialing
1 LLC Low Loop Current Detect
(set for CTR21)
0 LCN Loop Current Needed
U50 LCDN Loop Current Debounce
On Time
U51 LCDF Loop Current Debounce
Off Time
U52 XMTL Transmit Level
U67:
13:12
MINI
9 ILIM
7 DCR DC Impedance Select
6OHSOn-Hook Speed
3:2 DCV DC Termination Select
1 RZ Ringer Impedance
0 RT Ringer Threshold Select
U68 2 BTE Billing Tone Protect Enable
1 ROV Receive Overload
0 BTD Billing Tone Detected